The peritoneal tuberculosis is one of the differential diagnosis of ascites, but its documentation is provided by the presence of necrotizing granulomas as mycobacterial growth in samples taken from the peritoneum. This article presents the case of a patient with abdominal pain and ascites with the documentation of nodular lesions in the peritoneal cavity, with markedly elevated levels of "Carbohidrate Antigen o Cancer Antigen" CA 125, without changes in other organs. The peritoneum biopsies reports necrotizing granulomas and growth of mycobacteria in culture, then she received anti TB treatment with adequate response reducing the ascites' amount and earning weight.
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